directory-union 0.1.0

Merge directories with duplicate files into a single union directory with duplicates removed.
Documentation 
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use tokio::fs::{read_dir, File};
use tokio::io::AsyncReadExt;

#[tokio::main]
async fn main() -> Result<(), Box<dyn std::error::Error>> {
    let mut dir = read_dir("./tests").await?;
    while let Some(entry) = dir.next_entry().await? {
        println!("{:?}", entry)
    }

    let mut test_file = File::open("./tests/test.txt").await?;
    let mut contents = Vec::new();
    test_file.read_to_end(&mut contents).await?;
    println!("len = {}", contents.len());

    tokio::spawn(async move { Ok::<(), String>(()) });

    Ok(())
}